2d image to a 3d model
What you are referring to is called Photogrammetry, another option could be a 3D scanner

At this stage there aren't any options available in blender and I don't know of any addons. What is currently available is standalone software that creates a 3d model from an image. Some of the available options listed in the above link might be used to get a 3d model that you could then import into blender.

Normally blender users use images as a reference when modeling or sculpting within blender. An image can be shown in the 3DView as a background image or attached to an empty.